Image recognition system with selectively variable brightness an

Details Image recognition system with selectively variable brightness an Image recognition system with selectively variable brightness an

1991-03-18

1992-11-10

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 8, 250205, G01J 132

Patent

active

051631024

ABSTRACT:
An image recognition apparatus includes a light source including a plurality of light emitting diodes having different wavelengths, for illuminating an object, a driver for selectively operating the light emitting diodes and adjusting the brightness thereof, an image pick-up device for photoelectrically transferring the light reflected from the object into an image signal, and an image decision device for comparing a reference image signal with the image signal obtained by the image pick-up device and then deciding whether an image corresponding to the obtained image signal is clearer than an image corresponding to the reference image signal, the image decision device making the driver sequentially operates the light emitting diodes and change the brightness thereof in such a manner that the image corresponding to the image signal is clearer than the image corresponding to the reference image signal.

REFERENCES:
patent: 4694186 (1987-09-01), Onoda et al.
patent: 4700061 (1987-10-01), Ishikawa
patent: 4894524 (1990-01-01), Murase et al.
patent: 4927266 (1990-05-01), Sugiura et al.
patent: 5029245 (1991-07-01), Keranen et al.
patent: 5060065 (1991-10-01), Wasserman

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